Tagged: mooneyrivlin


March 13, 2021 at 6:07 amaman7SubscriberHello,nI am working to model a material using MooneyRivlin (MR) model. I have the experimental data. I used the curve fitting tool in ansys to find the coefficients of MR model. Now I want to verify the model with simulation. I made a cylindrical sample of material and I have given it the displacement equivalent to strain in material during experiment so that it gets loaded under same strain rate. Now the VonMises stresses I am getting from the simulation are not matching the experimental values as I have used the same experimental data to drive its model. I think conversely it should give similar stress under similar loading. Can anybody help me in this regarding? n

March 14, 2021 at 4:00 pmpeteroznewmanSubscribernWatch the ANSYS Course video on Hyperelastic curve fitting.nIt describes how to validate the material model results against the experimental data.nThe example uses a unit cube with edge length of 1 m. The model outputs the reaction force for an applied displacement on one face. Since the force acts on a face that has an area of 1 sq. m the force has the same units as Engineering Stress in Pa. Similarly, since the length of the cube is 1 m, the applied displacement is equivalent to Engineering Strain.n

March 15, 2021 at 5:33 amaman7SubscribernThank you for your reply. The video is informative. But in mean time I get to know that hyperelastic material FEM face problems of shear and volumetric locking. I have seen some videos that suggest using reduced integration. nI don't know how to use reduced integration?n

March 15, 2021 at 10:53 ampeteroznewmanSubscribernReduced Integration may be automatically selected by the solver. Read the Solution Output and look for Keyops.nReduced Integration is set by Keyops, often Keyop,2,1. Look in Ansys Help in the Element Library for the element used in your model.n

March 16, 2021 at 5:30 am

March 16, 2021 at 12:05 pmpeteroznewmanSubscribernSOLID186 is a Quadratic element and has only two choices: Full Integration and Uniform Reduced Integration.nUnder Mesh, set the Element Order to Linear. SOLID185 has four choices for Element Technology.ntKEYOPT(2)nElement technology:nt0  nFull integration with n method (default)nt1  nUniform reduced integration with hourglass controlnt2  nEnhanced strain formulationnt3  nSimplified enhanced strain formulationn

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